Research on Difference in Lateral Ride Comfort between Front and Rear Ends for Power Car of Power Concentrated EMUs
Regarding to the difference in lateral ride comfort between the front and rear ends of the carbody when the power car of power concentrated electric multiple units was running on site,the dynamics simulation was carried out to study its formation mechanism and influence factors,and several mitigation measures were proposed.By establishing the dynamics model with respect to the power car through the software of Simpack,the two layouts of yaw dampers including skew symmetry and opening outward were compared.Based on analysis of the influence of key suspension parameters on lateral ride comfort for the front and rear ends of the carbody,the modal analysis method was utilized to investigate the influence of the lateral installation angle of yaw dampers on hunting stability and the phase lag between the carbody's lateral and yaw modes.In addition,with the optimization goals of linear stability and the lateral ride comfort of the front and rear ends,the multi-objective optimization of the yaw damper damping,joint stiffness and lateral installation angle was implemented,and the Sobol global sensitivity for the optimized suspension parameters was conducted in terms of the optimization results.The results show that in the case of the yaw damper layout with the skew symmetry,the optimized suspension parameters have little impact on the difference in lateral ride comfort between the front and rear ends of the carbody,with the lateral installation angle of yaw dampers insensitive to the carbody lateral stability.However,in the case of the power car using the yaw damper layout with the opening outside,an appropriate lateral installation angle of yaw dampers can significantly reduce or even eliminate the difference in lateral ride comfort between the front and rear ends of the carbody,with lateral ride comfort and linear stability both sensitive to the lateral installation angle,whose desired selection range is 2°～6°.
power carthe difference in lateral ride comfortmodal analysismulti-objective optimizationsensitivity analysis
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